<template>
  <div>
    <el-switch
      v-model="draggable"
      active-color="#13ce66"
      active-text="开启拖拽"
      inactive-text="关闭拖拽"
      inactive-color="#ff4949"
    ></el-switch>
    <el-button v-if="draggable" @click="batchSave">批量保存</el-button>
    <el-button type="danger" @click="batchDelete">批量删除</el-button>
    <el-tree
      :data="menus"
      :props="defaultProps"
      :expand-on-click-node="false"
      show-checkbox
      node-key="catId"
      :default-expanded-keys="expandedKey"
      :draggable="draggable"
      :allow-drop="allowDrop"
      @node-drop="handleDrop"
      ref="menuTree"
    >
      <span class="custom-tree-node" slot-scope="{ node, data }">
        <span>{{ node.label }}</span>
        <span>
          <el-button
            v-if="node.level <= 2"
            type="text"
            size="mini"
            @click="() => append(data)"
          >Append</el-button>
          <el-button
            v-if="node.childNodes.length == 0"
            type="text"
            size="mini"
            @click="() => remove(node, data)"
          >Delete</el-button>
          <el-button type="text" size="mini" @click="() => edit(node, data)">Edit</el-button>
        </span>
      </span>
    </el-tree>

    <!--保存的 对话框 -->
    <el-dialog
      :title="title"
      :visible.sync="dialogVisible"
      :close-on-click-modal="false"
      width="30%"
    >
      <el-form :model="category">
        <el-form-item label="分类名称">
          <el-input v-model="category.name" autocomplete="off"></el-input>
        </el-form-item>
        <el-form-item label="图标">
          <el-input v-model="category.icon" autocomplete="off"></el-input>
        </el-form-item>
        <el-form-item label="计量单位">
          <el-input v-model="category.productUnit" autocomplete="off"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="dialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="submitData">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
//这里可以导入其他文件（比如：组件，工具js，第三方插件js，json文件，图片文件等等）
//例如：import 《组件名称》 from '《组件路径》';

export default {
  //import引入的组件需要注入到对象中才能使用
  components: {},
  props: {},
  data() {
    return {
      category: {
        name: "",
        parentCid: 0,
        catLevel: 0,
        showStatus: 1,
        sort: 0,
        icon: "",
        productUnit: "",
        catId: null,
        productCount: "",
      },
      //是否可以拖拽
      draggable: false,
      // 最高分类按钮等级
      maxLevel: 0,
      // 设置对话框的显示
      dialogVisible: false,
      //设置对话框是 新增还是 编辑
      dialogType: "",
      // 对话框的标题
      title: "",
      // 展示指定的菜单
      expandedKey: [],
      pCid: [],
      // 分类按钮集合
      menus: [],
      //要修改的分类集合
      updateNodes: [],
      defaultProps: {
        children: "children",
        label: "name",
      },
    };
  },

  //计算属性 类似于data概念
  computed: {},
  //监控data中的数据变化
  watch: {},
  //方法集合
  methods: {
    getMenus() {
      this.$http({
        url: this.$http.adornUrl("/product/category/list/tree"),
        method: "get",
      }).then(({ data }) => {
        console.log("成功获取到菜单数据...", data.data);
        this.menus = data.data;
      });
    },
    submitData() {
      console.log("弹出框的类型===>" + this.dialogType);
      if (this.dialogType == "add") {
        this.addCategory();
      }
      if (this.dialogType == "edit") {
        this.editCategory();
      }
    },
    // 编辑三级分类的方法
    editCategory() {
      // var {catId,icon,productUnit,name}=this.category;

      // var data={catId,icon,productUnit,name}
      console.log("修改三级分类数据" + this.category);
      this.$http({
        url: this.$http.adornUrl("/product/category/update"),
        method: "post",
        data: this.$http.adornData(this.category, false),
        // data: this.$http.adornData(data, false),
      }).then(({ data }) => {
        console.log("修改三级分类数据--成功", data);
        this.$message({
          message: `菜单修改成功`,
          type: "success",
        });
        this.dialogVisible = false;
        this.getMenus();
        this.expandedKey = [this.category.catId];
      });
    },
    // 添加三级分类的方法
    addCategory() {
      console.log("添加三级分类数据" + this.category);
      this.$http({
        url: this.$http.adornUrl("/product/category/save"),
        method: "post",
        data: this.$http.adornData(this.category, false),
      }).then(({ data }) => {
        console.log("添加三级分类数据--成功", data);
        this.$message({
          message: `菜单保存成功`,
          type: "success",
        });
        this.dialogVisible = false;
        this.getMenus();
        this.expandedKey = [this.category.parentCid];
      });
    },
    append(data) {
      // 显示对话框
      this.dialogVisible = true;
      this.dialogType = "add";
      this.title = "添加分类";

      //点击 append数据重置
      this.category.name = "";
      this.category.parentCid = data.catId;
      this.category.catLevel = data.catLevel * 1 + 1;
      this.category.showStatus = 1;
      this.category.sort = 0;
      this.category.icon = "";
      this.category.productUnit = "";
      this.category.catId = null;
      this.category.productCount = "";
      console.log("append", data);
    },
    // 编辑菜单
    edit(data) {
      this.dialogVisible = true;
      this.dialogType = "edit";
      this.title = "编辑分类";
      console.log("1要修改的数据", data);
      this.$http({
        url: this.$http.adornUrl("/product/category/info/" + data.data.catId),
        method: "get",
        params: this.$http.adornParams({}),
      }).then(({ data }) => {
        console.log("回显的数据", data.data);
        this.category.name = data.data.name;
        this.category.catId = data.data.catId;
        this.category.icon = data.data.icon;
        this.category.productUnit = data.data.productUnit;
        this.category.sort = data.data.sort;
        this.category.parentCid = data.data.parentCid;
        this.category.productCount = data.data.productCount;
        this.category.showStatus = data.data.showStatus;
        this.category.catLevel = data.data.catLevel;

        //catLevel showStatus productCount
      });
    },
    //删除菜单
    remove(node, data) {
      this.$confirm(`是否删除当前菜单[${data.name}], 是否继续?`, "提示", {
        confirmButtonText: "确定",
        cancelButtonText: "取消",
        type: "warning",
      })
        .then(() => {
          var ids = [data.catId];
          this.$http({
            url: this.$http.adornUrl("/product/category/delete"),
            method: "post",
            data: this.$http.adornData(ids, false),
          }).then(({ data }) => {
            console.log("删除成功", node, data);
            this.$message({
              message: `菜单删除成功`,
              type: "success",
            });
            this.getMenus();
            this.expandedKey = [node.parent.data.catId];
          });
        })
        .catch(() => {
          this.$message({
            type: "info",
            message: "已取消删除",
          });
        });
      console.log("remove", node, data);
    },
    //批量删除方法
    batchDelete() {

      let catIds = [];
      let checkedNodes = this.$refs.menuTree.getCheckedNodes();
      console.log("当前选中的元素", checkedNodes);
      for (let i = 0; i < checkedNodes.length; i++) {
        catIds.push(checkedNodes[i].catId);
      }
      console.log("当前选中的元素", catIds);


     this.$confirm(`是否刪除所选中的菜单, 是否继续?`, "提示", {
        confirmButtonText: "确定",
        cancelButtonText: "取消",
        type: "warning",
      }).then(() => {
          this.$http({
            url: this.$http.adornUrl("/product/category/delete"),
            method: "post",
            data: this.$http.adornData(catIds, false),
          }).then(({ data }) => {
            console.log("删除成功",data);
            this.$message({
              message: `菜单删除成功`,
              type: "success",
            });
            this.getMenus();
            //展示被删除的父节点
            this.expandedKey = [checkedNodes[0].parentCid == undefined  ? 0 : checkedNodes[0].parentCid];
          });
        })
        .catch(() => {
          this.$message({
            type: "info",
            message: "已取消删除",
          });
        });
    },
    //批量保存的方法
    batchSave() {
      this.$http({
        url: this.$http.adornUrl("/product/category/update/sort"),
        method: "post",
        data: this.$http.adornData(this.updateNodes, false),
      }).then(({ data }) => {
        console.log("菜单顺序等修改成功", data);
        this.$message({
          message: `菜单顺序等修改成功`,
          type: "success",
        });
        //刷新菜单
        this.getMenus();
        //默认展示的节点
        this.expandedKey = this.pCid;
        this.updateNodes = [];
        this.maxLevel = 0;
      });
    },
    // 拖动成功后的事件处理
    //共四个参数，依次为：被拖拽节点对应的 Node、结束拖拽时最后进入的节点、被拖拽节点的放置位置（before、after、inner）、event
    handleDrop(draggingNode, dropNode, dropType, ev) {
      console.log(draggingNode, dropNode, dropType);
      console.log("tree drop: ", dropNode.label, dropType);
      //1 当前节点最新的父节点ID
      let pCid = 0;
      let siblings = null;
      if (dropType == "before" || dropType == "after") {
        //拖动到顶层
        pCid =
          dropNode.parent.data.catId == undefined
            ? 0
            : dropNode.parent.data.catId;
        // if (Array.isArray(dropNode.parent.data)) {
        //
        //   console.log("拖动到顶层")
        //   pCid = 0;
        // } else {
        //   pCid = dropNode.parent.data.catId;
        // }
        siblings = dropNode.parent.childNodes;
      } else {
        pCid = dropNode.data.catId;
        siblings = dropNode.childNodes;
      }
      this.pCid.push(pCid);
      //2 当前拖拽节点的最新顺序
      for (let i = 0; i < siblings.length; i++) {
        if (siblings[i].data.catId == draggingNode.data.catId) {
          //如果遍历的节点是当前正在拖拽的节点
          let catLevel = draggingNode.data.catLevel;
          if (siblings[i].level != draggingNode.level) {
            //当前节点的层级发生变化
            catLevel = siblings[i].level;
            //修改子节点层级
            this.updateChildNodeLevel(siblings[i]);
          }
          this.updateNodes.push({
            catId: siblings[i].data.catId,
            sort: i,
            parentCid: pCid,
          });
        } else {
          this.updateNodes.push({ catId: siblings[i].data.catId, sort: i });
        }
      }
      console.log(this.updateNodes);
      //3 当前拖拽节点的最新层级
    },
    updateChildNodeLevel(node) {
      for (let i = 0; i < node.childNodes.length; i++) {
        var cNode = node.childNodes[i].data;
        this.updateNodes.push({
          catId: cNode.catId,
          catLevel: node.childNodes[i].level,
        });
        this.updateChildNodeLevel(node.childNodes[i]);
      }
    },
    //拖拽时判定目标节点能否被放置。type 参数有三种情况：'prev'、'inner' 和 'next'，分别表示放置在目标节点前、插入至目标节点和放置在目标节点后
    allowDrop(draggingNode, dropNode, type) {
      //1、被拖动的当前节点以及所在的父节点总层数不能大于3

      //1）、被拖动的当前节点总层数
      console.log("allowDrop:", draggingNode, dropNode, type);
      //
      this.countNodeLevel(draggingNode);
      //当前正在拖动的节点+父节点所在的深度不大于3即可
      let deep = Math.abs(this.maxLevel - draggingNode.level) + 1;
      console.log("深度：", deep);

      //   this.maxLevel
      if (type == "inner") {
        // console.log(
        //   `this.maxLevel：${this.maxLevel}；draggingNode.data.catLevel：${draggingNode.data.catLevel}；dropNode.level：${dropNode.level}`
        // );
        return deep + dropNode.level <= 3;
      } else {
        return deep + dropNode.parent.level <= 3;
      }
    },
    countNodeLevel(node) {
      //找到所有子节点，求出最大深度
      if (node.childNodes != null && node.childNodes.length > 0) {
        for (let i = 0; i < node.childNodes.length; i++) {
          if (node.childNodes[i].level > this.maxLevel) {
            this.maxLevel = node.childNodes[i].level;
          }
          this.countNodeLevel(node.childNodes[i]);
        }
      }
    },
    // 判断该节点 是否可以拖拽
    // allowDrop(draggingNode, dropNode, type) {
    //   console.log("判断该节点 是否可以拖拽", draggingNode, dropNode, type);

    //   this.countNodeLevel(draggingNode.data);

    //   //该节点的最大level 减去当前level +1

    //   console.log("maxLevel", this.maxLevel);
    //   console.log(" draggingNode.data.catLevel", draggingNode.data.catLevel);

    //   // let deep = this.maxLevel - draggingNode.data.catLevel + 1;
    //   let deep = Math.abs(this.maxLevel - draggingNode.level) + 1;
    //   console.log("深度", deep);

    //   if (type == "inner") {
    //     return deep + dropNode.level <= 3;
    //   } else {
    //     return deep + dropNode.parent.level <= 3;
    //   }
    // },
    // //统计被拖动节点的子元素
    // countNodeLevel(node) {
    //   console.log("查看 拖拽的最大等级", node);
    //   console.log(node.children != null);

    //   console.log(node.children.length > 0);
    //   if (node.children != null && node.children.length > 0) {
    //     console.log(node.children != null);
    //     console.log(node.children.length > 0);
    //     for (let i = 0; i < node.children.length; i++) {
    //       console.log("catLevel", node.children[i].catLevel);
    //       if (node.children[i].catLevel > this.maxLevel) {
    //         this.maxLevel = node.children[i].catLevel;
    //       }
    //       this.countNodeLevel(node.children[i]);
    //     }
    //   }
    // }
  },
  //生命周期 - 创建完成（可以访问当前this实例）
  created() {
    this.getMenus();
  },
  //生命周期 - 挂载完成（可以访问DOM元素）
  mounted() {},
  beforeCreate() {}, //生命周期 - 创建之前
  beforeMount() {}, //生命周期 - 挂载之前
  beforeUpdate() {}, //生命周期 - 更新之前
  updated() {}, //生命周期 - 更新之后
  beforeDestroy() {}, //生命周期 - 销毁之前
  destroyed() {}, //生命周期 - 销毁完成
  activated() {}, //如果页面有keep-alive缓存功能，这个函数会触发
};
</script>
<style scoped>
</style>